S. A. Arendsen Hein 



251 



the OR and the GB larvae in that they do not display the red brown 

 colour in any stage of the colouring process. 



As was stated before the BA beetle is very rare. If it occasionally 

 appears at all as a single individual freshly emerged amidst the mixed 

 population of CB and OR beetles, it immediately attracts attention by 

 the striking contrast of black and white. All that was stated above to 

 be light brown and dark brown in^he newly emerged GB and OR 

 beetles, is in the BA beetle black or a shade of black, which appears 

 at first diffusely in the white body, giving when coloration is complete to 

 the whole body with its appendages that coal black tint by which the 

 BA beetle is marked off from the OR and the GB beetle. In the latter 

 the legs, antennae and abdominal segments, also after their final colour- 

 ing, preserve a red brown, or, at any rate, a much lighter hue than the 

 rest of the body. In the BA beetle all these organs are uniformly coal 

 black. 



In addition to this difference in colour of the organs just mentioned, 

 it is characteristic of the BA beetle that the black colour appears 

 in the very first stage of the pigmentation process, i.e. in the pupa, and 

 later in the freshly emerged beetle at the same time and on exactly the 

 same parts of the organs as the red-brown in the OR or GB beetle. 



In the latter the black (in the adult coloured beetle) is less intense. 

 It mostly shows still a tinge of the initial red-brown, and displays itself 



